full gonzo

Performing an extraordinary action or doing something with full force without holding anything back.

Marsellus went full gonzo on Zed.

Everyone went full gonzo when Prince played Let’s Go Crazy.

Full Gonzo

When someone no longer holds back in their consumption of drugs, especially for psychedelics.

"Good god man! Did you see all the Mescaline he just took?"
"I did, he's gone full Gonzo!"